CN115943632A - Method for controlling sink device, source device and HDMI - Google Patents
Method for controlling sink device, source device and HDMI Download PDFInfo
- Publication number
- CN115943632A CN115943632A CN202180006288.1A CN202180006288A CN115943632A CN 115943632 A CN115943632 A CN 115943632A CN 202180006288 A CN202180006288 A CN 202180006288A CN 115943632 A CN115943632 A CN 115943632A
- Authority
- CN
- China
- Prior art keywords
- source device
- information
- hdmi
- edid
- sink
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000006870 function Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4108—Peripherals receiving signals from specially adapted client devices characterised by an identification number or address, e.g. local network address
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42684—Client identification by a unique number or address, e.g. serial number, MAC address, socket ID
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/43615—Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
- G09G2370/045—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial
- G09G2370/047—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial using display data channel standard [DDC] communication
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/12—Use of DVI or HDMI protocol in interfaces along the display data pipeline
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Systems (AREA)
- Communication Control (AREA)
Abstract
The present disclosure provides a method of controlling a High Definition Multimedia Interface (HDMI). The method can comprise the following steps: reading, by the source device, extended Display Identification Data (EDID) of the sink device when the sink device is connected with the source device; writing information about a source device in a Status and Control Data Channel (SCDC) structure; and the source device reads the EDID again based on a predetermined field value included in the SCDC structure.
Description
Technical Field
The present disclosure relates to a method of controlling sink devices (sink devices) and source devices through a high-definition multimedia interface (HDMI). More particularly, the present disclosure relates to a method for transmitting and receiving data between a source device and a sink device through HDMI and controlling transmission and reception of the data.
Background
In recent years, digital image display devices capable of displaying high-quality images have been widely used. In particular, display devices such as an Organic Light Emitting Diode (OLED) Television (TV) using an OLED as a light emitting device and a Liquid Crystal Display (LCD) TV in which pixels are disposed in front of a light emitter or a reflector can display high definition images.
As the use of these display devices in combination with input devices, such as Set Top Boxes (STBs), xbox, nintendo, etc., has increased, a Digital Video Interface (DVI) or a High Definition Multimedia Interface (HDMI) has been used as a digital interface for data transmission between devices.
HDMI is a multimedia interface for transmitting uncompressed all-digital audio/video signals over a single cable. That is, the HDMI can provide an interface between a source device such as an audio/video source, STB, xbox, and a receiving device such as a monitor, digital television.
A device that transmits an audio-video signal to a receiving device such as a digital television through a digital interface of the HDMI is called a digital interface device. The digital interface devices may include not only various Digital Video Disc (DVD) devices, but also STBs, VTRs and game consoles.
In the related art, when a source device is connected to a sink device, the source device reads only Extended Display Identification Data (EDID) of the sink device, but the sink device cannot obtain information about the source device.
Disclosure of Invention
Technical problem
It is an object of the present disclosure to address the above and other problems.
The present disclosure is directed to obtaining information on a source device connected to a sink device through a High Definition Multimedia Interface (HDMI).
Specifically, the present disclosure is directed to effectively managing Extended Display Identification Data (EDID) through information acquisition and data exchange between a source device and a sink device, which are connected through HDMI.
Technical scheme
In one aspect of the present disclosure, a method of controlling a High Definition Multimedia Interface (HDMI) is provided. The method can comprise the following steps: reading, by the source device, extended Display Identification Data (EDID) of the sink device when the sink device is connected with the source device; writing information about a source device in a Status and Control Data Channel (SCDC) structure; and reading, by the source device, the EDID again based on a predetermined field value included in the SCDC structure.
The method may further comprise: the sink device checks vendor information about the source device based on the written information about the source device.
The method may further comprise: the reception apparatus updates the EDID based on the supplier information.
The method may further comprise: the sink device controls display of the sink device based on the written information about the source device.
The method may further comprise: the sink device disables unnecessary operations related to the source device based on the written information about the source device.
The method may further comprise: the sink device detects whether information on the source device is written in the SCDC structure at a predetermined cycle.
The source device reading the EDID of the sink device may further include: the source device checks the manufacturer Identifier (ID) of the sink device.
The information about the source device may include capability information about the source device.
The method may further include the source device storing the new EDID in the memory when the EDID is updated.
In another aspect of the present disclosure, a receiving device for use in conjunction with an HDMI cable is provided. The receiving device may include an HDMI receiver and a controller. The controller may be configured to: detecting whether the source device writes information about the source device in an SCDC structure when connected to the source device through the HDMI sink; and checking vendor information about the source device based on the written information about the source device, when the source device writes the information about the source device in the SCDC structure.
In yet another aspect of the present disclosure, a source device for use in conjunction with an HDMI cable is provided. The source device may include an HDMI transmitter and a controller. The controller may be configured to: reading EDID of the receiving device when connected to the receiving device through the HDMI transmitter; writing information about the source device in the SCDC structure; and reading the EDID of the reception apparatus again based on a predetermined field value included in the SCDC structure.
Advantageous effects
As is apparent from the above description, the present disclosure has the following effects.
According to at least one embodiment of the present disclosure, the sink device may provide the EDID optimized for the source device, thereby effectively managing the EDID.
According to at least one embodiment of the present disclosure, the sink device may update the EDID to control the source device based on the information about the source device.
According to at least one embodiment of the present disclosure, a sink device may disable unnecessary user experience (UX) operations based on information about a source device.
According to at least one embodiment of the present disclosure, the source device may read the EDID without a Hot Plug Detection (HPD) switch.
Additional areas of applicability of the present disclosure will become apparent from the detailed description provided hereinafter. However, it should be understood that the detailed description and specific examples (e.g., preferred embodiments of the disclosure) are given by way of illustration only, since various changes and modifications within the spirit and scope of the disclosure will become apparent to those skilled in the art from this detailed description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the principle of the disclosure.
Fig. 1 is a view illustrating a source device and a sink device connected through a high-definition multimedia interface (HDMI) cable according to an embodiment of the present disclosure.
Fig. 2 is a block diagram illustrating an HDMI system including an HDMI source device 2010 and an HDMI sink device 2020 according to an embodiment of the present disclosure.
Fig. 3 is a block diagram illustrating a source device and a sink device according to an embodiment of the present disclosure.
Fig. 4 is a flowchart for explaining a method of controlling HDMI according to an embodiment of the present disclosure.
Fig. 5 is a diagram illustrating a Status and Control Data Channel (SCDC) structure according to an embodiment of the present disclosure.
Fig. 6 is a diagram for explaining manufacturer-specific fields of the SCDC structure according to an embodiment of the present disclosure.
Fig. 7 is a flowchart illustrating an operation of a source device according to an embodiment of the present disclosure.
Fig. 8 is a flowchart illustrating an operation of a receiving apparatus according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the present specification, the same or equivalent components will be provided with the same reference numerals, and thus the description thereof will not be repeated. The suffixes "module" and "unit" of elements herein are used for convenience of description and thus may be used interchangeably and do not have any distinguishable meaning or function. If it is determined that detailed description of the related art would obscure the gist of the present disclosure, the detailed description will be omitted. It is also to be understood that the drawings are solely for purposes of providing a better understanding of embodiments of the present disclosure and that the spirit of the disclosure is not limited to the drawings. The disclosure should be construed as extending to any variations, equivalents, and alternatives except those specifically set forth in the drawings.
Although terms such as "first," "second," etc. may be used to describe various components, these components are in no way limited by the above terms. The above terms are only used to distinguish one element from another.
When an element is "coupled" or "connected" to another element, it will be understood that a third element may be present between the two elements, although the element may be directly coupled or connected to the other element. When an element is "directly coupled" or "directly connected" to another element, it is understood that no element is present between the two elements.
The singular is intended to include the plural unless the context clearly indicates otherwise.
Furthermore, it will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or combinations thereof.
The present disclosure proposes a technique of controlling a display device, such as an organic light emitting diode/light emitting diode (OLED/LED) Television (TV) and a monitor, that is, a source device connected to a sink device through a High Definition Multimedia Interface (HDMI) by acquiring capability information on the source device and exchanging data with the source device.
The HDMI can operate based on information about the sink device, which is obtained by the source device by reading Extended Display Identification Data (EDID) by HPD switching. However, in the related art, the sink device may not obtain capability information on the source device.
The receiving device may require a specific control operation depending on the source device. However, conventional Consumer Electronics Control (CEC) and packet operations provide limited functionality only within the scope of HDMI capabilities. In particular, the following problems may occur: there are too many functions provided at one time, and EDID has space limitation and compatibility.
Accordingly, the present disclosure proposes a method by which a sink device provides optimized EDID to a source device to efficiently manage the EDID.
Fig. 1 is a view illustrating a source device and a sink device connected through an HDMI cable according to an embodiment of the present disclosure.
In fig. 1, a source device 1010 is shown as an example of a source device, a sink device 1020 is shown as an example of a sink device, and an HDMI cable 1030 is shown as an example of a digital interface cable.
The source device may include various image signal output devices, such as a set-top box (STB), a cable receiving device, a satellite broadcasting receiving device, and a personal computer. The receiving device may include various image display devices, for example, a digital television, a monitor, and a projector. The digital interface cable may include a Digital Video Interface (DVI) cable in addition to the HDMI cable.
In recent years, with the advent of various multimedia contents, various multimedia devices for playing and transmitting various multimedia contents have been developed together. In addition, interface technologies have also been developed to conveniently provide signal connections between them without loss. Among interface technologies, HDMI is the most representative multimedia interface.
HDMI is an interface/standard for electronic products, which has been developed from the interface standard DVI for personal computers and displays. Since the HDMI transmits video/audio from the player to the display device without compression, the HDMI has little delay between receiving devices. Furthermore, since a decoder chip or software is not required, HDMI has high format compatibility.
Since HDMI is capable of processing digital video and audio at 5Gbps without compression, HDMI has the following advantages: HDMI has a simple circuit, does not suffer from quality degradation, supports copyright protection of content by HDCP (high-bandwidth digital content protection), and allows a single cable connection. In addition, since HDMI is compatible with DVI which is widely used in the computer industry, the application of HDMI is also increasingly developed.
On the other hand, the HDMI standard defines a Consumer Electronics Control (CEC) and CEC bus capable of simply controlling a plurality of multimedia devices connected on a network. According to CEC, one device can simply control multimedia devices connected through HDMI without separately controlling them, and thus, a user can easily link the devices.
Hereinafter, a case where an HDMI cable is connected as a digital interface is assumed.
Fig. 2 is a block diagram illustrating an HDMI system including an HDMI source device 2010 and an HDMI sink device 2020 according to an embodiment of the present disclosure.
HDMI includes three independent communication channels: transition Minimized Differential Signaling (TMDS) channels; a Display Data Channel (DDC); and a CEC channel through which audio/video data, device information, and control commands can be transmitted and received.
The HDMI source device 2010 transmits video and audio signals included in a moving image signal to the HDMI sink device 2020 through a TMDS channel. The HDMI receiving apparatus 2020 receives video and audio signals transmitted through the TMDS channel while storing standard information in an EDID Read Only Memory (ROM). The TMDS channel supports data transmission of 5Gbps or less and is responsible for transmitting and receiving video and audio signals.
The HDMI source device 2010 may obtain detailed information stored in the EDID ROM of the HDMI sink device 2020 through the DDC channel and then transmit video and audio signals optimized for the HDMI sink device 2020. The DDC channel has a function of implementing an optimal screen by referring to standard information on the HDMI source device 2010. Here, the standard information may correspond to a data communication standard defined by Video Electronics Standards Association (VESA), which is an international standard organization. Specifically, the HDMI source device 2010 may obtain detailed information on the HDMI sink device 2020 from the EDID output by the HDMI sink device 2020 through the DDC channel. Based on the detailed information, the HDMI source device 2010 may convert the media data according to the display environment of the HDMI sink device 2020 and transmit the converted media data to the HDMI sink device 2020 through the TMDS channel. For example, the EDID may include a manufacturer Identifier (ID) indicating a manufacturing company, a product ID indicating a product model, information on functions supported by the display device, timing information, and the like.
The HDMI source device 2010 and the HDMI sink device 2020 can exchange control commands on the CEC channel. The CEC channel is an additional protocol for performing high-level control functions in the HDMI.
The HDMI sink 2020 may include various digital broadcasting devices supporting the HDMI-CEC function. The HDMI-CEC function refers to a function of controlling CEC-based products through HDMI. The HDMI-CEC function is an optional function of HDMI. For example, the HDMI-CEC function may include the following functions for a CEC-based product: automatic start-up, automatic signal routing, single-point remote control.
According to the present disclosure, the HDMI source device 2010 and the HDMI sink device 2020 may exchange information about resolution and error occurrence through the CEC channel, thereby configuring the optimal resolution. Hereinafter, the HDMI source device 2010 and the HDMI sink device 2010 may be referred to as an HDMI transmitter and an HDMI receiver, respectively.
Fig. 3 is a block diagram illustrating a source device and a sink device according to an embodiment of the present disclosure.
As described above, the source device 3100 may include various image signal output devices, for example, a Digital Video Disc (DVD) player, an STB, a cable receiving device, a satellite broadcasting receiving device, a personal computer, and the like. The receiving device 3200 may include various image display devices, for example, a digital television, a monitor, a projector, and the like. The HDMI cable 3300 may include a CEC line.
In an embodiment according to the present disclosure, the source device 3100 may include a source device controller 3110, an image signal input device 3120, and an HDMI transmitter 3130. The image signal input device 3120 may receive and process video, audio, and data contents such as MPEG streams and transmit the video, audio, and data contents to the HDMI transmitter 3130. The HDMI transmitter 3130 may transmit a signal including video, audio, and data content (such a signal may also be referred to as an image signal) to the sink device 3200 through the HDMI cable 3300.
The sink device 3200 may include a sink device controller 3210, an HDMI receiver 3220, an image signal processor 3230, and an image signal output device 3240. The HDMI receiver 3220 may receive an image signal through the HDMI cable 3300 and transmit the image signal to the image signal processor 3230. The image signal processor 3230 may perform signal processing on an image signal and transmit the processed signal to the image signal output device 3240. The image signal output device 3240 may output the processed image signal to a user.
Hereinafter, an embodiment in which the above source device and sink device are connected through HDMI will be described. That is, the details of the source device, the sink device, and the HDMI described above can be applied.
Fig. 4 is a flowchart for explaining a method of controlling HDMI according to an embodiment of the present disclosure.
In step S410, the sink device and the source device may be connected through the HDMI cable.
In step S420, the source device may switch the power line of 5V from a low level to a high level and apply a current after connecting the HDMI cable.
In step S430, the reception apparatus may switch the HPD line to a high level. By doing so, the sink device can notify the source device that the HDMI cable is normally connected and enable the EDID-related circuit, thereby allowing the source device to access the EDID information.
In step S440 following steps S420 and S430, the source device may read the EDID. In this case, the sink device may include various information about the sink device in the EDID and transmit the EDID to the source device. The source device may read the EDID and check information about the sink device. In an embodiment of the present disclosure, the source device may check the manufacturing ID of the sink device by reading the EDID of the sink device. Details thereof will be described later with reference to fig. 5.
Steps S410 to S440 may be performed immediately after the sink device and the source device are connected through the HDMI cable. Steps S410 to S440 may be the same as in the prior art.
The present disclosure will be described in detail with reference to steps S440 (S450.
In step S450, the source device may write capability information about the source device in a Status and Control Data Channel (SCDC) structure. Details thereof will be described later with reference to fig. 6. According to an embodiment of the present disclosure, the sink device may check whether information about the source device is written in the SCDC structure at a predetermined cycle.
In step S460, the receiving device may set a value of a predetermined field in the SCDC structure. Specifically, the receiving apparatus may set the RR field of the SCDC structure. Details thereof will be described later with reference to fig. 6.
In an embodiment of the present disclosure, the sink device may check vendor information about the source device based on capability information about the source device, which is written in the SCDC structure by the source device. Thereafter, the sink device may update the EDID based on the vendor information about the source device. The sink device may control a display (the image signal output device of fig. 3) of the sink device based on the written capability information on the source device. The sink device may disable unnecessary operations related to the source device based on the written capability information related to the source device.
In step S470, the source device may read the EDID of the sink device again. Specifically, the source device may read the EDID again based on the value of the RR field of the SCDC structure. When the EDID is updated, the source device may store the new EDID in the memory.
Fig. 5 is a diagram illustrating an SCDC structure according to an embodiment of the present disclosure.
SCDC is added with the update of HDMI standard 2.0. SCDC is a point-to-point communication channel based on I2C (DDC). The protocol provides a mechanism for a receiving device (I2C slave) to request a source device (I2C master) to initiate a status check read to exchange data between the receiving device and the source device.
That is, the SCDC is a one-to-one communication protocol based on I2C serial communication, which enables data exchange between the HDMI source device and the HDMI sink device. The SCDC includes a mechanism in which a sink device corresponding to an I2C slave device requests a status check read from a source device corresponding to an I2C master device, and the source device reads a corresponding status from the sink device upon receiving the request.
If the receiving device supports the SCDC, the receiving device needs to set the SCDC _ Present in the HF-VSDB or the SCDB of the EDID. If the SCDC _ Present is '1', the source device needs to access the SCDC register.
The SCDC structure is stored in the memory of the receiving device and may include data similar to the structure shown in fig. 5. In fig. 5, R/W indicates whether the source device can read only or simultaneously read/write data based on the SCDC structure stored in the sink device.
The following fields are included in the SCDC structure of FIG. 5.
-receiver version field: this field may indicate whether the SCDC structure is compatible and provide version information about the receiving device.
-source version field: this field may indicate whether the SCDC structure is compatible. If the sink device reads the EDID from the sink device, and if the SCDC _ Present of the EDID is set to '1', the source version field of the SCDC structure is set to '1'.
Update flags (Update _0, update _ 1) field: if the information (status, character error detection, etc.) that the sink device needs to provide to the source device changes, the corresponding bit is set to '1'.
-TMDS configuration (TMDS _ Config) field: if each of the TMDS _ Bit _ Clock _ Ratio and the Scrambling _ Enable occupies one Bit, and if the source device attempts to Enable the Scrambling function of the sink device, the corresponding Bit is set to '1'.
-scrambler status field: if the receiving device detects a scrambled control code sequence, the corresponding bit is set to '1'.
-a configuration (Config _ 0) field: this field is used to configure capability information on the source device and the sink device.
-Status Flag (Status _ Flag _0, status _flag _) field: this field indicates whether the data received via the clock and channels 0, 1 and 2 was successfully decoded.
In HDMI standard 2.1, a manufacturer specific field 501 is included in the SCDC structure. In this case, the manufacturer specific field 501 in the SCDC structure may include the supplier's definition. According to embodiments of the present disclosure, whether the manufacturer-specific field 501 can be read or read and written can be determined by the vendor. According to an embodiment of the present disclosure, 34 bytes may be assigned to the manufacturer specific field 501.
In an embodiment of the present disclosure, a sink device may obtain capability information about a source device. How the sink device obtains the capability information on the source device will be described with reference to fig. 6 to 8.
Fig. 6 is a diagram for explaining manufacturer-specific fields of the SCDC structure according to an embodiment of the present disclosure.
Referring to fig. 6, the source devices may exchange capability information through a manufacturer-specific field that is specified as a vendor defined offset in the SCDC structure. However, the information in the fields of fig. 6 is merely an example, and it is apparent that other offsets and bits may be defined.
In an embodiment of the present disclosure, the source device may read the EDID of the sink device. In this case, the source device may write the manufacturer-specific field into the SCDC structure of the sink device. Similarly, if the capability information on the source device is written in the manufacturer-specific field, the sink device may set the EDID _ RR field 601 in the SCDC structure to '1'.
In other words, the sink device may provide EDID optimized for the connected source device by defining the EDID Read Request (RR) in a manufacturer-specific field.
According to the current specification, the source device can update the EDID of the sink device only through HPD switching. However, according to an embodiment of the present disclosure, the source device may read the EDID through the manufacturer-specific field without HPD switching according to a request from the sink device.
In an embodiment of the present disclosure, the source device may monitor the 0xFC field 601 (monitor and poll). Accordingly, when the value of the EDID _ RR field 601 is set to '1', the source device may read the EDID of the sink device again.
In an embodiment of the present disclosure, the sink device may update the EDID of the sink device based on the capability information about the source device and control the mode and brightness of the image signal output device according to the SCDC structure shown in fig. 6.
In an embodiment of the present disclosure, the sink device may disable unnecessary user experience (UX) operations related to the source device based on the capability information about the source device.
For example, if the source device does not support FreeSeSync, the sink device may disable the FreeSeSync on/off menu on the UX of the sink device.
For example, if the source device does not support dolby vision, the sink device may delete DV-VSVDB from the EDID and request the source device to read the EDID from which the DV-VSVDB is deleted again.
For another example, if the source device does not support FreeSeSync, the sink device may delete FS-VSDB from EDID and request the source device to read the EDID deleted FS-VSDB again.
Since various source devices using HMDI may or may not support FreeSync or DVLL (dolby visual low delay), the sink device needs to reflect DV-VSVDB in EDID.
According to the embodiments of the present disclosure, such a problem can be solved.
Fig. 7 is a flowchart illustrating an operation of a source device according to an embodiment of the present disclosure.
In step S701, when the source device is connected to the sink device through the HDMI, the source device may read the EDID. In this case, a connection between the source device and the sink device may be established as described in fig. 4.
In step S702, the source device may check the manufacturer ID of the sink device. Specifically, the source device may check the manufacturer ID of the sink device as a specific vendor. For example, the source device may check that the manufacturer ID is "GSM (Gold Star manual)". In addition, the source device may check whether the SCDC exists. Specifically, the source device may check whether "SCDC _ Present" exists.
In step S703, the source device may write capability information about the source device in a manufacturer-specific field of the SCDC structure. Specifically, when the manufacturer ID of the sink device is checked and the SCDC structure exists, the source device may write capability information on the source device in a manufacturer-specific field of the SCDC structure.
In step S704, the source device may poll the EDID RR from the sink device. Specifically, the source device may monitor the EDID RR field value of the SCDC structure. In this case, the source device may monitor the EDID RR field value at a predetermined period. That is, when the capability information on the source device is written in the manufacturer-specific field, the sink device may set the EDID RR field value to '1' and request the source device to read the EDID. Accordingly, the source device may monitor the EDID RR field value and check whether the EDID RR field value is set to '1'.
In step S705, the source device may read the EDID again and store the EDID in the memory. Specifically, when the EDID is updated, the source device may read the new EDID again and store the new EDID in the memory. When the EDID RR field value is set to '1', the source device may read and cache the EDID.
Fig. 8 is a flowchart illustrating an operation of a receiving apparatus according to an embodiment of the present disclosure.
In step S801, the sink device may be connected to the source device through HDMI. In this case, the sink device and the source device may be connected according to the above-described embodiments.
In step S802, the sink device may detect whether the source device is written in a manufacturer-specific field of the SCDC structure. In one embodiment of the present disclosure, the sink device may detect whether the source device is written as follows: the receiving apparatus may perform detection continuously (interrupt method) or at a predetermined cycle (polling method).
In step S803, the sink device may refer to the value written in the manufacturer-specific field by the source device. In an embodiment of the present disclosure, the sink device may check vendor information about the source device.
In step S804, the sink device may check whether the value written by the source device is a vendor type to perform a control operation.
If the value written by the source device is a predetermined vendor type in step S804, the sink device may control various functions based on the vendor type in step S805. In an embodiment of the present disclosure, the reception apparatus may update the EDID based on the vendor type. After optimizing the EDID, the sink device may request reading from the source device. The receiving apparatus may change a picture mode and adjust brightness based on a vendor type. Further, the reception apparatus may control the UX based on the vendor type.
Specifically, the reception apparatus may update the EDID. After the EDID is optimized, the sink device may request the source device to read the EDID. For example, if vendor A only supports DV-LL with 4K HFR, the receiving device may change the current DV-VSVDB to maximum support of 4K 60p and support recording of DV-Std and DV-LL as follows: DV-VSVDB is DV-LL with only 4K HFR. Further, when vendor A does not support FreeSesync, the receiving device may delete the existing FS-VSDB (14 bytes).
The receiving device can change the picture mode of the display and control the brightness. For example, when vendor A is a PC GPU, the receiving device may change the picture mode of the display and control the brightness according to the PC GPU. Similarly, when the vendor a is a game console, the reception apparatus may switch the screen mode of the display to the game mode according to the game console. That is, the receiving apparatus may control the display according to the vendor type.
The receiving device may control UX/UI (user interface) operations. For example, when vendor a does not support FreeSync, the receiving device may disable the UX/UI associated with FreeSync when vendor a is connected.
Accordingly, the sink device can provide and manage the EDID optimized for the source device.
The present disclosure may be embodied as computer readable codes in a program recording medium. The computer readable medium may include various recording devices that store computer system-readable data. The computer readable medium may include a Hard Disk Drive (HDD), a Solid State Disk (SSD), a Silicon Disk Drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like. Further, the computer readable medium may include carrier wave type implementations (e.g., transmission via the internet). Further, the computer may include the control unit 180 of the terminal apparatus. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the present disclosure should be determined by a fair interpretation of the following claims. Further, it is intended that the present disclosure cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.
Claims (19)
1. A method of controlling a high definition multimedia interface, HDMI, the method comprising:
based on a sink device being connected to a source device through an HDMI cable, the source device reading extended display identification data EDID of the sink device, wherein information about the source device is written in a first structure; and
the source device reads the EDID again based on a predetermined field value in the first structure.
2. The method of claim 1, further comprising: the sink device checks vendor information about the source device based on the written information about the source device.
3. The method of claim 2, further comprising: the receiving device updates the EDID based on the vendor information.
4. The method of claim 2, further comprising: the sink device controls display of the sink device based on the written information about the source device.
5. The method of claim 2, further comprising: the sink device disables an operation related to the source device based on the written information about the source device.
6. The method of claim 1, further comprising: the sink device detects whether information on the source device is written in the first structure at a predetermined cycle.
7. The method of claim 1, comprising: the source device checks the manufacturer identifier ID of the sink device.
8. The method of claim 1, wherein the information about the source device comprises capability information about the source device.
9. The method of claim 1, further comprising: the source device stores a new EDID in the memory based on the EDID being updated.
10. A receiving device for use in conjunction with a high definition multimedia interface, HDMI, cable, the receiving device comprising:
an HDMI receiver; and
a controller for controlling the operation of the electronic device,
wherein the controller is configured to:
detecting, based on the sink device being connected to a source device through the HDMI receiver, whether the source device writes information about the source device in a first structure; and
checking vendor information about the source device based on the written information about the source device, wherein the written information is written when the source device writes the information about the source device in the first structure.
11. The reception apparatus according to claim 10, further comprising: updating extended display identification data EDID based on the vendor information.
12. The reception apparatus according to claim 10, further comprising: controlling display of the sink device based on the written information about the source device.
13. The reception apparatus according to claim 10, further comprising: disabling an operation related to the source device based on the written information about the source device.
14. The reception apparatus according to claim 10, further comprising: it is detected whether information on the source device is written in the first structure at a predetermined cycle.
15. The sink device of claim 10, wherein the information about the source device comprises capability information about the source device.
16. A source device for use in conjunction with a high definition multimedia interface, HDMI, cable, the source device comprising:
an HDMI transmitter; and
a controller, wherein the controller is configured to:
reading extended display identification data EDID of a sink device based on the source device being connected to the sink device through the HDMI transmitter, wherein information on the source device is written in a first structure; and
the EDID of the receiving device is read again based on a predetermined field value in the first structure.
17. The source apparatus of claim 16, wherein the controller is further configured to check a manufacturer Identifier (ID) of the sink apparatus.
18. The source device of claim 16, wherein the information about the source device comprises capability information about the source device.
19. The source device of claim 16, wherein the controller is further configured to store a new EDDID in memory based on the EDID being updated.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020210073967A KR20220165395A (en) | 2021-06-08 | 2021-06-08 | Method for controlling hdmi and source device and sink device |
| KR10-2021-0073967 | 2021-06-08 | ||
| PCT/KR2021/011602 WO2022260213A1 (en) | 2021-06-08 | 2021-08-30 | Method of controlling sink device, source device, and high-definition multimedia interface (hdmi) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115943632A true CN115943632A (en) | 2023-04-07 |
Family
ID=84284514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180006288.1A Pending CN115943632A (en) | 2021-06-08 | 2021-08-30 | Method for controlling sink device, source device and HDMI |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US11606593B2 (en) |
| EP (1) | EP4352965A1 (en) |
| JP (1) | JP7530957B2 (en) |
| KR (1) | KR20220165395A (en) |
| CN (1) | CN115943632A (en) |
| AU (1) | AU2021450042A1 (en) |
| WO (1) | WO2022260213A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4287632A4 (en) * | 2021-08-03 | 2024-09-25 | Samsung Electronics Co Ltd | Electronic apparatus and image processing method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090058868A1 (en) * | 2007-09-03 | 2009-03-05 | Samsung Electronics Co., Ltd. | Image display device and method of changing edid information thereof |
| US20140375878A1 (en) * | 2013-06-25 | 2014-12-25 | Kabushiki Kaisha Toshiba | Video processing system, video output apparatus, video display apparatus and video processing method |
| CN106134210A (en) * | 2014-03-24 | 2016-11-16 | Lg电子株式会社 | HDMI is utilized to carry out the apparatus and method of data transmission and reception |
| CN106464964A (en) * | 2014-03-13 | 2017-02-22 | Lg电子株式会社 | Device and method for transmitting and receiving data using HDMI |
| CN107409242A (en) * | 2015-03-23 | 2017-11-28 | Lg 电子株式会社 | The method and apparatus for sending/receiving electric power using HDMI |
| CN112073659A (en) * | 2020-09-08 | 2020-12-11 | 海信视像科技股份有限公司 | HDMI (high-definition multimedia interface) control method and device and display equipment |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070040094A (en) * | 2005-10-11 | 2007-04-16 | 주식회사 대우일렉트로닉스 | Edid update apparatus |
| KR20100104025A (en) * | 2009-03-16 | 2010-09-29 | 삼성전자주식회사 | Apparatus to process signal of digital multimedia interface and method thereof |
| JP5655562B2 (en) * | 2010-12-28 | 2015-01-21 | ソニー株式会社 | Electronic device, control method of electronic device, transmission device, and reception device |
| JP2012199643A (en) * | 2011-03-18 | 2012-10-18 | Panasonic Corp | Communication control system and sink device |
| US9942605B2 (en) * | 2014-03-12 | 2018-04-10 | Lg Electronics Inc. | Devices and methods for transmitting and receiving data of a sink device to change video display resolution based on error counter value detected at the sink device using HDMI |
| KR102310241B1 (en) * | 2015-04-29 | 2021-10-08 | 삼성전자주식회사 | Source device, controlling method thereof, sink device and processing method for improving image quality thereof |
| JP2020160227A (en) * | 2019-03-26 | 2020-10-01 | Ｎｅｃディスプレイソリューションズ株式会社 | Display device and connection control method of display device |
| US20220392422A1 (en) | 2019-10-25 | 2022-12-08 | Sony Group Corporation | Information processing system, information processing method, and program |
-
2021
- 2021-06-08 KR KR1020210073967A patent/KR20220165395A/en active Search and Examination
- 2021-08-30 JP JP2022502228A patent/JP7530957B2/en active Active
- 2021-08-30 WO PCT/KR2021/011602 patent/WO2022260213A1/en active Application Filing
- 2021-08-30 CN CN202180006288.1A patent/CN115943632A/en active Pending
- 2021-08-30 EP EP21945280.2A patent/EP4352965A1/en active Pending
- 2021-08-30 AU AU2021450042A patent/AU2021450042A1/en active Pending
- 2021-09-10 US US17/472,489 patent/US11606593B2/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090058868A1 (en) * | 2007-09-03 | 2009-03-05 | Samsung Electronics Co., Ltd. | Image display device and method of changing edid information thereof |
| US20140375878A1 (en) * | 2013-06-25 | 2014-12-25 | Kabushiki Kaisha Toshiba | Video processing system, video output apparatus, video display apparatus and video processing method |
| CN106464964A (en) * | 2014-03-13 | 2017-02-22 | Lg电子株式会社 | Device and method for transmitting and receiving data using HDMI |
| US20170092226A1 (en) * | 2014-03-13 | 2017-03-30 | Lg Electronics Inc. | Device and method for transmitting and receiving data using hdmi |
| CN106134210A (en) * | 2014-03-24 | 2016-11-16 | Lg电子株式会社 | HDMI is utilized to carry out the apparatus and method of data transmission and reception |
| CN107409242A (en) * | 2015-03-23 | 2017-11-28 | Lg 电子株式会社 | The method and apparatus for sending/receiving electric power using HDMI |
| CN112073659A (en) * | 2020-09-08 | 2020-12-11 | 海信视像科技股份有限公司 | HDMI (high-definition multimedia interface) control method and device and display equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2021450042A1 (en) | 2023-11-23 |
| EP4352965A1 (en) | 2024-04-17 |
| US20220394317A1 (en) | 2022-12-08 |
| JP2023533623A (en) | 2023-08-04 |
| KR20220165395A (en) | 2022-12-15 |
| WO2022260213A1 (en) | 2022-12-15 |
| JP7530957B2 (en) | 2024-08-08 |
| US11606593B2 (en) | 2023-03-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US12080256B2 (en) | Electronic device and control method thereof | |
| US9900653B2 (en) | Transmission device and reception device | |
| US8185669B2 (en) | Signal output device of HDMI device and method thereof | |
| US9554179B2 (en) | Method and apparatus for transmitting and receiving data using HDMI | |
| US20100231795A1 (en) | Apparatus to process signal of digital interface and method thereof | |
| JP2006072333A (en) | Data relay device, data relay method, data display system, and data system | |
| JP2009253644A (en) | Electronic apparatus and method for transmitting control signal in electronic apparatus | |
| US20170115740A1 (en) | Method and device for transmitting/receiving data using hdmi | |
| US20240040079A1 (en) | Reception Device, Method for Controlling Reception Device, and Transmission/Reception System | |
| US20170116138A1 (en) | Method and apparatus for transmitting and receiving data using hdmi | |
| US20080244680A1 (en) | Connection status checking apparatus and connection status checking method | |
| KR20070092785A (en) | Display device and method of the driving | |
| US11606593B2 (en) | Method of controlling sink device, source device, and high-definition multimedia interface (HDMI) | |
| KR20090132722A (en) | Method and apparatus for processing a signal of image display device | |
| KR20070083341A (en) | Method for controlling electronic apparatus using digital interface | |
| KR20100089328A (en) | A display device | |
| KR20110041143A (en) | Display device, display system and method for upgrading software | |
| US20220060781A1 (en) | Display Of Video Content On A Sink Device Using Advanced Features | |
| JP2010140291A (en) | Data receiver and power supply control method | |
| KR100850964B1 (en) | Display system including a display device and one or more devices to be connected the display device, and method for controlling the display system | |
| WO2013001879A1 (en) | Information presentation device, information management system, video device, and portable terminal | |
| KR20070020569A (en) | Data display system, data relay device, data relay method, data system, and sink device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |